Earth's Great Extinctions
by Rachel Phillips, The Great Courses
Recommended: Use a credit. This book costs $20.52 (27% more than a credit's $14.95 value). You save $5.57 by using a credit.
3 hours: "Earth's Great Extinctions" by Rachel Phillips, The Great Courses is a shorter Science & Engineering. Rated 4.0/5. Cost: $6.62/hour. A credit works well here.
Low credit value — buy directly instead
Value Score 0.6 is below 2. This book is short relative to its price, so spending a credit here wastes -$5.57 of credit value. Buy it directly on Amazon and save your credit for a longer book.
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